Meanwhile, Schmidt suggested on Thursday that Wales broke Six Nations protocol by going direct to the tournament organisers to ask for the Principality Stadium roof to be closed on account of forecast heavy rain.

"It's our stadium and we should be able to do what we want with it," said Gatland.

Wales and France have both won three Grand Slams since the championship became the Six Nations in 2000

Permutations in full

A Wales win would give them the Six Nations title and Grand Slam. An additional three points are awarded to Grand Slam winners, which would put Wales out of England's reach

A draw for Wales would be enough to win the championship if England lose. If both sides draw, England would win the title if they earn a bonus point and Wales don't

If Wales and Ireland draw and England win, Eddie Jones' side would be champions

Ireland will be champions if they win and England don't

Should Ireland secure a bonus-point win over Wales and England beat Scotland without scoring four tries, the two teams will finish level on 19 points. Points difference would then decide the championship: England currently lead the way with 83, compared to Ireland's 19

Predictions from BBC Radio 5 Live pundits

Former England scrum-half Matt Dawson: "Super Saturday is my favourite international weekend of the year but I think Wales might well nick the Slam."

Former Ireland wing Shane Horgan: "It's too early to say whether Ireland have recovered from the early setback against England. Wales."

Former England fly-half Paul Grayson: "I didn't back my instincts and got it wrong in round one so I'm going to go with my gut. Ireland win in Cardiff so England win the title."

"We believe we can win and that's what we're working to do. Scotland teams tend to be underdogs on a number of occasions and it usually brings the best out in them."

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Ryan Wilson and Danny Care get to the bottom of the scuffle in the tunnel at Murrayfield

Stick at 21?

Saturday's Six Nations gets under way at 12:30 GMT with a match between two desperately out of form sides, Italy and France.

Italy's 57-14 defeat by England in the last round was a record 21st successive defeat in the Six Nations. Their last victory in the tournament against Scotland in February 2015. and they are already assured of the Wooden Spoon.

But France are also enduring a miserable run with just two wins in their past 11 Tests.

After restricting Six Nations leaders Wales to a 26-15 scoreline in Rome and leading Ireland at half-time of a 26-16 defeat, coach Conor O'Shea is hoping for a third strong home performance of the campaign.

"Our focus will be on ourselves, trying to play our best rugby. We want to finish the championship with a great performance at Stadio Olimpico," he said.

Conor O'Shea and attack coach Mike Catt (left) are hoping of a first Six Nations win in more than four years